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<base href="https://bugs.webkit.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Overflow check elimination fails for a simple test case"
href="https://bugs.webkit.org/show_bug.cgi?id=147387">147387</a>
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<th>Summary</th>
<td>Overflow check elimination fails for a simple test case
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>Product</th>
<td>WebKit
</td>
</tr>
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<th>Version</th>
<td>528+ (Nightly build)
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>Normal
</td>
</tr>
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<th>Priority</th>
<td>P2
</td>
</tr>
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<th>Component</th>
<td>JavaScriptCore
</td>
</tr>
<tr>
<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>fpizlo@apple.com
</td>
</tr></table>
<p>
<div>
<pre>The test case:
function foo(o) {
var result = 0;
for (var i = 0; i < 100; ++i) // ++i still has an overflow check in the emitted code
result += o.f;
return result;
}
noInline(foo);
var p = {f:42};
var o = Object.create(p);
for (var i = 0; i < 10000; ++i) {
p.f = i;
foo(o);
}</pre>
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</p>
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